<div class="accordion" fillSpace="sidebar">
    <volist name="menu" id="group">
        <notempty name="group['son']">
            <div class="accordionHeader">
                <h2><span>Folder</span>{$group['title']}</h2>
            </div>
            <div class="accordionContent">
                <ul class="tree treeFolder">
                    <volist name="group['son']" id="sons">
                        <notempty name="sons['son']">
                            <li><a href="javascript:;">{$sons[title]}</a>
                                <ul>
                                    <volist name="sons['son']" id="son">
                                        <li><a href="{:U($son['name'].'/index')}" target="navTab" rel="{$son['name']}">{$son[title]}</a></li>
                                    </volist>
                                </ul>
                            </li>
                        </notempty>
                        <empty name="sons['son']">
                            <li><a href="{:U($sons['name'].'/index')}" target="navTab" rel="{$sons['name']}">{$sons[title]}</a></li>
                        </empty>
                    </volist>
                </ul>
            </div>
        </notempty>
    </volist>
</div>